ST72325 datasheet(151/196 Pages) STMICROELECTRONICS

Part #	ST72325

Description	8-bit MCU with 16 to 60K Flash/ROM, ADC, CSS, 5 timers, SPI, SCI, I2C interface

PDF	196 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Figure 76. Typical Application with a Crystal or Ceramic Resonator

Figure 77 Application with a Crystal or Ceramic Resonator for ROM (LQFP64 or any 48/60K ROM)

3. The relatively low value of the RF resistor, offers a good protection against issues resulting from use in a humid envi-

ronment, due to the induced leakage and the bias condition change. However, it is recommended to take this point into

account if the µC is used in tough humidity conditions.

3. For CL1 and CL2 it is recommended to use high-quality ceramic capacitors in the 5-pF to 25-pF range (typ.) designed

for high-frequency applications and selected to match the requirements of the crystal or resonator. CL1 and CL2, are usu-

ally the same size. The crystal manufacturer typically specifies a load capacitance which is the series combination of CL1

and CL2. PCB and MCU pin capacitance must be included when sizing CL1 and CL2 (10 pF can be used as a rough esti-

mate of the combined pin and board capacitance).

OSC2

OSC1

fOSC

CL1

CL2

ST72XXX

RESONATOR

WHEN RESONATOR WITH

INTEGRATED CAPACITORS

VDD/2

Ref

POWER DOWN

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FEEDBACK

LOOP

LINEAR

AMPLIFIER

ST72325 Datasheet(PDF) 151 Page - STMicroelectronics